QLED display panel and preparation method thereof, and display device

Abstract

The invention relates to the technical field of display, and discloses a QLED display panel and a preparation method thereof, and a display device. The QLED display panel comprises a first substrate and a second substrate that are oppositely arranged; a first electrode, a hole injection layer, a hole transmission layer, a quantum dot light-emitting layer, an electron transmission layer and a second electrode that are formed between the first substrate and the second substrate and arranged along the direction of the first substrate toward the second substrate, and the display panel further comprises a first ion type coordination compound layer formed on one side, facing the quantum dot light-emitting layer, of the hole transmission layer, the first ion type coordination compound layer is internally provided with a first internal electric field, one side, close to the hole transmission layer, of the first internal electric field is a positive electrode, and one side, close to the quantumdot light-emitting layer, of the first internal electric field is a negative electrode. The QLED display panel is additionally provided with an ion type coordination compound layer, the injection ofthe hole from the hole transmission layer to the quantum dot light-emitting layer can be improved, the carrier in the quantum dot light-emitting layer is balanced, so that the efficiency and the service life of the display panel are improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a QLED display panel, a preparation method thereof, and a display device. Background technique [0002] As a new type of luminescent material, quantum dots (Quantum Dot, QD for short) have the advantages of high light color purity, high luminous quantum efficiency, adjustable luminous color, and long service life. hotspot. Therefore, quantum dot light-emitting diodes (Quantum Dot Light Emitting Diodes, QLED for short) which use quantum dot materials as the light-emitting layer have become the main direction of research on new display devices. [0003] In the current QLED device structure, electron injection in quantum dot materials (especially red and green quantum dots) is generally superior to hole injection due to reasons such as energy level positions, and electrons occupy an advantage in the number of carriers, making the device The carrier is very unbalanced, which becom...

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Problems solved by technology

[0004] The present invention provides a QLED display panel, its preparation method, and a display device. The above-mentioned QLED display panel solves the problem that the carriers in the QLED display panel are not calm due to the different injection efficiency of holes and electrons into the quantum dot light-emitting layer.

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